Abstract
A melt grown crystal of gadolinium gallium garnet containing dislocations with a density of about 3 × 10 3 / cm 2 was analyzed by X-ray diffraction topography. Most of the dislocations appear to have Burgers vectors in the 〈111〉 direction parallel to the growth axis. These dislocations make relatively small angles with the growth axis so they are predominantly screw in character. Some evidence for the existence of decorated edge dislocations was found. In addition, anisotropy of growth band contrast was observed. This effect is interpreted in terms of elastic stresses between bands of different lattice parameter.
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